When a 4 cubic ft block of wood floats in a fluid whose weight density is 60 pounds per cubic foot, 3/4 of the block's volume is submerged. The buoyant force on the block is 60 pounds
Indicate whether the statement is true or false
F
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When heating 2 kg of ice from –40°C, 2 kg of water from 20°C to 50°C, and 2 kg of steam from 100°C to 125°C, which requires the most energy?
a. the ice b. the water c. The steam, it's obvious since it is the hottest. d. All three take the same amount.
A lightweight object and a very heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises to a greater height?
A) The heavy object, because it has greater kinetic energy. B) The light object, because it has smaller kinetic energy. C) The lightweight object, because it weighs less. D) The heavy object, because it weighs more. E) They both slide to the same height.
A system consisting of a positively-charged particle and an electric field
A. loses potential difference and kinetic energy when the charged particle moves in the direction of the field. B. loses electric potential energy when the charged particle moves in the direction of the field. C. loses kinetic energy when the charged particle moves in the direction of the field. D. gains electric potential energy when the charged particle moves in the direction of the field. E. gains potential difference and electric potential energy when the charged particle moves in the direction of the field.
When an electron moves from the n = 1 to the n = 3 orbit:
a. the radius doubles and the angular momentum increases by a factor of 9. b. the radius increases by a factor of 9, and the angular momentum triples. c. both the radius and the angular momentum increase by a factor of 9. d. both the radius and the angular momentum triple.